Sarah Wayne Callies (“Prison Break”) and Cynthia Watros Guest StarHouse and the team take on the case of a woman Julia (guest star Callies), who is in an open marriage and becomes ill during a date with her on-the-side boyfriend. As perplexing as the case is, Julia’s happy and healthy, yet polygamous relationship is equally baffling to the team. Meanwhile, House tests Wilson’s relationship with Sam (guest star Watros) in the all-new “Open and Shut” episode of HOUSE airing Monday, April 26 (8:00-9:00 PM ET/PT) on FOX. (HOU-619) (TV-14 D, L, S)